<?php
/**
 * Created by PhpStorm.
 * User: dream
 * Date: 2019/4/20
 * Time: 2:23 PM
 */
namespace App\Service;
class UrlEncode{
    public function UrlEncode($key,$data)
    {
            $key    =    md5($key);
            $x        =    0;
            $len    =    strlen($data);
            $l        =    strlen($key);
            $char = null;
            $str = null;
            for ($i = 0; $i < $len; $i++)
            {
                if ($x == $l)
                {
                    $x = 0;
                }
                $char .= $key{$x};
                $x++;
            }
            for ($i = 0; $i < $len; $i++)
            {
                $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
            }
            return base64_encode($str);
    }
    function Urldecrypt($key,$data)
    {
        $key = md5($key);
        $x = 0;
        $data = base64_decode($data);
        $len = strlen($data);
        $l = strlen($key);
        $char = null;
        $str = null;
        for ($i = 0; $i < $len; $i++)
        {
            if ($x == $l)
            {
                $x = 0;
            }
            $char .= substr($key, $x, 1);
            $x++;
        }
        for ($i = 0; $i < $len; $i++)
        {
            if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1)))
            {
                $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
            }
            else
            {
                $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
            }
        }
        return $str;
    }
}